According to the Definition of a Small Group in the Book,which

According to the definition of a small group in the book,which one of the following would not be defined as a small group?

A) five people who voluntarily serve in the Metro Civil Rights Commission to propose policy to the City Council
B) six people working for the same company on various projects in different departments
C) nine women who meet once a month on a Thursday in a support group for victims of wife abuse
D) four old men who meet weekly in the back of a local tavern in their "club" that promotes crime watch